public ActionResult DeleteRumor(string title)
        {
            try
            {
                var query = mapDb.Rumors.FirstOrDefault(s => s.Title == title);
                if (query != null)
                {
                    mapDb.Remove(query);
                    mapDb.SaveChanges();

                    return(Ok("删除成功!"));
                }

                return(BadRequest());
            }
            catch (Exception e)
            {
                return(BadRequest(e.Message));
            }
        }